Heterogeneous Supersaturation in Mixed Perovskites

Chih-Shan Tan, Yi Hou, Makhsud I. Saidaminov, Andrew Proppe, Yu Sheng Huang, Yicheng Zhao, Mingyang Wei, Grant Walters, Ziyun Wang, Yongbiao Zhao, Petar Todorovic, Shana O. Kelley, Lih-Juann Chen, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Thin-film solar cells based on hybrid lead halide perovskites have achieved certified power conversion efficiencies exceeding 24%, approaching those of crystalline silicon. This motivates deeper studies of the mechanisms that determine their performance. Twin defect sites have been proposed as a source of traps in perovskites, yet their origin and influence on photovoltaic performance remain unclear. It is found that twin defects—observed herein via both transmission electron microscopy and X-ray diffraction—are correlated with the amount of antisolvent added to the perovskite and that twin defects in the highest-performing perovskite photovoltaics are suppressed. Heterogeneous supersaturation nucleation is discussed as a contributor to efficient perovskite-based optoelectronic devices.
Original languageEnglish
Article number1903166
JournalAdvanced Science
Issue number7
StatePublished - Apr 2020


  • defects
  • perovskites
  • traps
  • twins

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